Hoisting apparatus for steam rock-drills



(E0 Model.) 3 Sheets-Sheet 1.

- M. O. BULLOCK.

HOISTING APPARATUS FOR STEAM BOOK DRILLS- No. 258,985. A Patented June6. 1882.

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(No Model.) 3 Sheets-Sheet 2.

, M. c.- BULLOCK. HOISTING APPARATUS FOR STEAMROGK DRILLS. No. 258,985. 7 Patented June-6, 1882.

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(No Model.)

M. o. BULLOCK.

HOISTING APPARATUS FOR STEAM ROGK'DRILLS.

Patented June 6, 1882.

U ITED STATES PATENT. O FI E.-

j M LAn o. BULLOCK, OF CHICAGO, ILLINOIS.

HOISTING APPARATUS FOR STEAM ROCK-DRlLLSg SPECIFIGATION fo rmingut of Letters recent Nb. 258,985, dated June 6, 1882.

To all whom it may concern Be it known that I, MILAN G. BULLOCK, a citizen of the United States, residing at Chi cago, in the county of Cook and State of Illi nois, have invented certain new and useful Improvements in Hoisting Apparatus for Steam Rock-Drills; andl do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters or figures of reference marked thereon, which form a part of this specification.

This invention relates more especially to that class of steam rock-drills the main or crank shaft of which is driven by a pair of steam-engines arranged at angles of forty-five degrees to a horizontal plane and at right angles to each other. v

My improvement consists mainlyin arranging the hoisting apparatus on the frame of the machine below the crank-shaft for the purpose of obtaining great strength and stability, combined with lightness and compactness.

It further consists of certain combinations of devices, which are set forth specifically in claims at the close of this specification, for operating the brakes of the hoisting apparatus.

In order that my invention may be fully understood, I have represented in the accompanyin g drawings, and will proceed to describe,

a steam rock-drill embodying the same in the best form at present known to me.

Figure 1 is a front elevation of asteam rockdrill embodying my improvements. Fig. 2 is a vertical section thereof in the plane indi-- cated by broken line 1 1 of Fig. 1. Fig. 3 is an end view of the hoisting-drum. Fig. 4 is a plan view of the hoisting-drum. Fig. 5 is a side elevation of the hoisting-drum. Fig. 6 illustrates the application of the cam-brake lever.

The same letters of reference refer-to like parts in all the figures.

The various parts of the machine are mounted on the bed-plate A and its standards A A A The cylinders B and G of the steam-angines are bolted to the bed-plate at reverse angles of forty-five degrees to the base thereof, with their piston-rods extending and converging upwardly toward the axis of the main or Application filed June 24, 1881. (No model.)

crank shaft D. The cylinders thus situated at right angles to each other are arranged so nearly opposite that their piston-rods may be connected by pitmen to the same double crank D of the crank-shaft. I prefer to make the cylinders of unequal bore, and to so'construct and apply the steam induction and exhaust devices that the cylinders and their adjuncts may be used either jointly as acompound steam-engineor separately as two separate hi gh-pressure steam-engines. I also prefer to use the variable and reversible eccentric E. (Shown in Fig. 2.) I claim neither of these features in this-patent,

as they are embodied and claimed in another application for Letters Patent filed in the Fatent Office of even date with the application for this patent. I alsoprefer to mount the drillspindle on a swivel-head such as shown, but which, being described and claimed in an application for Letters Patent filed January 27,

1881, I do not claim in this patent. g

The hoisting-drum F is mounted to turn on the shaft G, which is supported in hearings on the standards A and A below the crank-sh aft D. A large spur-wheel, G, is keyed to shaft G, adapted to be driven by a spur-pinion, D 011 the crank-shaft, the said pinion being so connected to the crank shaft -by feather and groove that it may be slid endwise thereon to throw it in and out of gear according as the hoisting apparatus is to be driven or not. The hoisting-drum is driven by the'spur-wheel H fixed on shaft G, through the intermediate spur wheels, H, which mesh with the internallytoothed but externally-smooth brakerim F on the hoisting-drum. The intermediate spurwheels, H, revolveon gudgeons I, carried by the thrust-wheel I, which is mounted to turn freely on shaft G, but may be held stationary by means of the friction strap encircling its grooved rim. This friction-strap is composed of two approximately-semicircular segments, J J, provided with ears j and j at one end,which 'att'ord facility for boltin g them together, and for attaching this friction-strap to a cross bar or bolt, J supported by standards J 3 J rising from and secured to the bedplate A, as shown in Figs. 3 and 4. The other ends of the segments also terminate in laterally projecting ears j and which are connected by an eyebolt, J but will still be a little distance apart when the segments are drawn together to tightly hug the thrust-wheel I. The nuts of the eyebolt are so adjusted that the wheel I can move freely in the frictionstrap. The eye-head of the eyebolt J is above the upper ear, 5', and pivoted to it is a forked horizon tally-projectin g cam-lever, K, the camheads k of which bear on the upper side of said earj, the cam-heads being so formed that by lifting the outer end or long arm of the lever its cam-hcads will, in conjunction with the eyebolt, draw the segments of the frictionstrap together and cause them to hug the thrust-wheel I.

A brake-stra p, L, constructed in all particulars like the friction -strap above described, encircles the brakewim F of the hoistingdrum, is secured to the same cross bar or bolt, 5 to which the frictionstrap is secured, and has the other ends of its segments in like manner connected by an eyeholt, L, to the eyehead of which is pivoted a forked horizontallyprojecting cam-lever, L but the eye-head of eyebolt L is lowermost, so that the cam-heads of the lever L hear on the under side of the not, m, on the screw-threaded portion at of the upright spindle M, which is,.at its lower 7 not move endwise.

end, supported in and connected to thebedplate, so that it may be turned axially, but can- The upper end of this spindle is provided with a hand-wheel, M, for turning it.

The spindle also carries a long sleeve, N, fitted in a fixed yoke, M which latter forms a bearing for the sleeved spindle near its upper end. The lower end, a, of the sleeve is screw-threaded, and carries a nut, n, to which the forks of the long arm of the cam-lever K are connected by links it and 70 A shoulder, M, on the sleeve is seated against the under side of yoke M and immediately above the yoke a hand-wheel, N, is fixed on the sleeve. Thus the sleeve may be independently turned on the spindle, butcannot move endwise. The oanrlevers prevent the nuts to which they are respectively linked from turning, so that by turning the handwheels M and N the nuts will be compelled to travel up or down on the screw-threaded portions of the rotating spinthrust-wheel,to stop the hoisting-drum whenever the driving-pinionl) is thrown out of gear, it cannot so act when said driving-pinion is in gear and running; but the brake-strap on the hoisting-drum may be used to stop the drum while pinion D is in gear and running, provided the friction-strap be opened to release thrust-wheel I.

The arrangement of the hoisting apparatus below the crank-shaft of the engine or engines brings it close down to the foundation of the machine, making the whole structure not only more compact, but also more stable, so that the parts may be made correspondingly lighter. The height of the machine and the size of the frame-work are also reduced thereby.

Usually the friction-strap is to be loosened simultaneously with tightening the brakestrap, and vice versa. Having the hand-wheels M and N one over the other makes it very convenient to operate one with the right hand and the other with the left hand to simultaneously operate the two straps in that way.

It is obvious that so far as the novel arrangement of the hoisting-drum is concerned it is immaterial whether the particular hoistingdrum hereinbefore described or any other known form of hoisting-drum is made use of, although I prefer the described form of hoisting-drumc Having thus described my invention, what I claim is-- 1., The combination, substan i l y as before set forth, of the steamcylinders set at reverse angles of fortyfive degrees on the bed-plate and at right angles to each other, the crankshaft overhead, the hoisting apparatus below the crank-shaft, and the wheel and pinion for transmitting the motion of the crank-shaft to the hoisting apparatus.

2. The combination, substantially as before set forth, of the segments of the brake-strap, the eyebolt, the cam-lever, the screw, and the traveling nut connected with the cam-lever to prevent said nut from turning.

MILAN O. BULLOCK.

\Vitnesses:

CHAS. W. GRIGGS, J. EDWARDS FAY. 

